Discovery of Pterobranchia [Graptolithoidea] in the Permian

• Autorzy: Mierzejewski P , Kulicki C.
• Języki publikacji: EN

Abstrakty

EN

The fossil remains of a hemichordate exoskeleton, recognized as fragments of the stolons and their cyst−like swellings connected with the fusellar zooidal tubes, were derived by chemical isolations from Late Permian (Kazanian) mudstones of the Svalis Dome (central Barents Sea, Norway). These fossils, referred to as Diplohydra szaniawskii sp. nov., are the first undoubted representatives of the class Graptolithoidea found in Permian deposits. The genus Diplohydra Kozłowski, 1959, known previously only from the Ordovician and originally established as a thecate hydroid taxon, is reinterpreted as an aberrant member of the order Rhabdopleuroidea. This strange hemichordate, characterized by fusellar tubes distinctly narrower than stolon−like tubes and their swellings, reveals a certain degree of dimorphism in the stolon system. D. szaniawskii sp. nov. also displays some peculiar morphological features common to the Ordovician rhabdopleuroid genus Rhabdopleurites Kozłowski and the stolonoid genus Stolonodendrum Kozłowski.

Słowa kluczowe

EN

fossil remains; Graptolithina; Graptolithoidea; paleobiology; Permian; remains; Norway; Rhabdopleuroidea; Pterobranchia

• Wydawca: -
• Czasopismo: Acta Palaeontologica Polonica
• Rocznik: 2002
• Tom: 47
• Numer: 1
• Opis fizyczny: p.169-175,fig.

Twórcy

autor

Mierzejewski P

• Polish Academy of Sciences, Twarda 51-55, 00-818 Warsaw, Poland

autor

Kulicki C.

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